Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4159a7e272bdcd…

MALICIOUS

PDF

83.1 KB Created: 2021-03-17 05:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c417c87baf638da7f1f4c83054cd518 SHA-1: 26744be5e834339ad857c96c69b3a6ad32693479 SHA-256: aa4159a7e272bdcdfbf50f1cfc4f845cfe0ec1f2f25eac3be10da65c071f49c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of embedded URLs and the overall detection profile strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/award?keyword=brujas+de+salem+libro+pdf PDF link annotation
    • http://muldwych.com/gotomoraxoroxotepefebuxid63mm.pdfIn PDF document text
    • http://mihetos.xyz/21799840699krcl5.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/32563058431.pdfIn PDF document text
    • http://metalllift.ru/tabla_periodica_completa_20191sy23.pdfIn PDF document text
    • http://ujjjrrrrr.space/sony_bdp-s3200_preciozpa50.pdfIn PDF document text
    • http://opros.xyz/densified_biomass_fuel_report9bi5y.pdfIn PDF document text
    • http://premium-cinema.com/dell_inspiron_3520_laptop_charger36hhu.pdfIn PDF document text
    • http://lovelyhouse.online/9433178003c1uni.pdfIn PDF document text
    • http://procripton.com/94933865036cr93i.pdfIn PDF document text
    • http://sis-paypal.com/how_to_find_the_line_of_best_fit_desmos39h4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5fe2af4e11c33.pdfIn PDF document text
    • http://begemotiks.space/demagagirekineralusogq6oqk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418199/normal_600352faa89b9.pdfIn PDF document text
    • http://gekenig.mywebcommunity.org/77809607419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lazesej/matlab_plot_matrix_line_style.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/tobifatagu.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/vovusofuvikajo.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/94773812419.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/iata_world_city_codes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 5452 bytes
SHA-256: 75ef7890a94919b67130f3f2ef033df813c9f65ccfb049af9f0d475b4b350b4a
font_01_sfnt_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 12180 bytes
SHA-256: fed942398424d0144007d1549d8916f12cf9c7e86d5e0fdd675e264989eb86cf

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